I often encountered the term high-frequency/low-frequency signals in an image. And relevantly, high-pass filters for sharpening. I have a hard time relating the word frequency with 2d images. An image is simply a 2-d array of 3 values (r,g,b). What does frequency mean in this context? And how does a high-pass filter become sharpening the image?
What are high-frequency/low-frequency signals in an image?
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It is related to fourier transform (AFAIK,
tin the formula isx,yof pixel coordinate).Roughly speaking :-
I am not so strong in this area.
To avoid stealing their contents, here are all good links.
They should contain information more than you need :-